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XJ POWER SEAT SYSTEMS 8R - 1

POWER SEAT SYSTEMS
TABLE OF CONTENTS

page page

GENERAL INFORMATION DIAGNOSIS AND TESTING
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . 1 POWER SEAT SYSTEM . . . . . . . . . . . . . . . . . . . . 2
POWER SEAT SYSTEM . . . . . . . . . . . . . . . . . . . . 1 CIRCUIT BREAKER . . . . . . . . . . . . . . . . . . . . . . . . 2
DESCRIPTION AND OPERATION POWER SEAT ADJUSTER AND MOTORS . . . . . . 2
POWER SEAT SWITCH. . . . . . . . . . . . . . . . . . . . . 1 POWER SEAT SWITCH. . . . . . . . . . . . . . . . . . . . . 2
POWER SEAT ADJUSTER AND MOTORS . . . . . . 1 REMOVAL AND INSTALLATION
CIRCUIT BREAKER . . . . . . . . . . . . . . . . . . . . . . . . 2 POWER SEAT SWITCH. . . . . . . . . . . . . . . . . . . . . 3
POWER SEAT ADJUSTER AND MOTORS . . . . . . 3

GENERAL INFORMATION tem. Refer to the owner's manual in the vehicle glove
box for more information on the features, use and
INTRODUCTION operation of the power seat system.
Six-way power seats are an available factory-in-
stalled option for Left-Hand Drive (LHD) versions of DESCRIPTION AND OPERATION
this model. Refer to 8W-63 - Power Seat in Group 8W
- Wiring Diagrams for complete circuit descriptions
POWER SEAT SWITCH
and diagrams.
The power seat can be adjusted in six different
NOTE: This group covers both Left-Hand Drive ways using the power seat switch. The switch is
(LHD) and Right-Hand Drive (RHD) versions of this located on the lower outboard side of the seat cushion
model. Whenever required and feasible, the RHD on the seat cushion side shield. Refer to the owner's
versions of affected vehicle components have been manual for more information on the power seat
constructed as mirror-image of the LHD versions. switch functions and the seat adjusting procedures.
While most of the illustrations used in this group The individual switches in the power seat switch
represent only the LHD version, the diagnostic and unit cannot be repaired. If one switch is damaged or
service procedures outlined can generally be faulty, the entire power seat switch unit must be
applied to either version. Exceptions to this rule replaced.
have been clearly identified as LHD or RHD, if a
special illustration or procedure is required. POWER SEAT ADJUSTER AND MOTORS
There are three reversible motors that operate the
power seat adjuster. The motors are connected to
POWER SEAT SYSTEM worm-drive gearboxes that move the seat adjuster
The power seat system option allows the front through a combination of screw-type drive units.
seating positions to be electrically adjusted for opti- The front and rear of a seat are operated by differ-
mum control and comfort using the power seat ent motors. They can be raised or lowered indepen-
switches located on the outboard seat cushion side dently of each other. When the center seat switch is
shield. The power seat system allows the seating pushed to the Up or Down position, both the front
position to be adjusted forward, rearward, front up, and rear motors operate in unison, moving the entire
front down, rear up, or rear down. The power seat seat up or down. The forward-rearward motor is
system receives battery current through a fuse in the operated by pushing the center seat switch to the
Power Distribution Center and a circuit breaker in Forward or Rearward position.
the junction block, regardless of the ignition switch When a switch is actuated, a battery feed and a
position. ground path are applied through the switch contacts
The power seat system includes the power seat to the motor(s). The motor(s) and drives operate to
adjuster and motors unit, the power seat switch, and move the seat in the selected direction until the
the circuit breaker. Following are general descrip- switch is released, or until the travel limit of the
tions of the major components in the power seat sys- power seat adjuster is reached. When the switch is
8R - 2 POWER SEAT SYSTEMS XJ
DESCRIPTION AND OPERATION (Continued)
moved in the opposite direction, the battery feed and from the Power Distribution Center (PDC) as
ground path to the motor(s) are reversed through the required.
switch contacts. This causes the motor to run in the
opposite direction. POWER SEAT ADJUSTER AND MOTORS
Each motor contains a self-resetting circuit breaker For circuit descriptions and diagrams, refer to
to protect it from overload. Consecutive or frequent 8W-63 - Power Seat in Group 8W - Wiring Diagrams.
resetting of the circuit breakers must not be allowed Operate the power seat switch to move all three
to continue, or the motors may be damaged. Make seat motors in each direction. The seat should move
the necessary repairs. in each of the selected directions. If the power seat
The power seat adjuster and motors cannot be adjuster fails to operate in only one direction, move
repaired, and are serviced only as a complete unit. If the adjuster a short distance in the opposite direction
any component in this unit is faulty or damaged, the and test again to be certain that the adjuster is not
entire power seat adjuster and motors assembly must at its travel limit. If the power seat adjuster still
be replaced. fails to operate in only one direction, see Power Seat
Switch in the Diagnosis and Testing section of this
CIRCUIT BREAKER group. If the power seat adjuster fails to operate in
An automatic resetting circuit breaker in the junc- more than one direction, proceed as follows:
tion block is used to protect the power seat system (1) Test the circuit breaker in the junction block as
circuit. The circuit breaker can protect the system described in this group. If OK, go to Step 2. If not
from a short circuit, or from an overload condition OK, replace the faulty circuit breaker.
caused by an obstructed or stuck seat adjuster. (2) Remove the power seat switch from the seat.
The circuit breaker cannot be repaired and, if Check for battery voltage at the fused B(+) circuit
faulty or damaged, it must be replaced. cavity of the power seat switch wire harness connec-
tor. If OK, go to Step 3. If not OK, repair the open
circuit to the junction block as required.
DIAGNOSIS AND TESTING (3) Check for continuity between the ground cir-
cuit cavity of the power seat switch wire harness con-
POWER SEAT SYSTEM nector and a good ground. There should be
Before any testing of the power seat system is continuity. If OK, go to Step 4. If not OK, repair the
attempted, the battery should be fully-charged and open circuit to ground as required.
all wire harness connections and pins cleaned and (4) Test the power seat switch as described in this
tightened to ensure proper continuity and grounds. group. If the switch tests OK, check the wire harness
For circuit descriptions and diagrams, refer to 8W-63 for the inoperative power seat motor(s) between the
- Power Seat in Group 8W - Wiring Diagrams. power seat switch and the motor for shorts or opens.
With the dome lamp on, apply the power seat If the circuits check OK, replace the faulty power
switch in the direction of the failure. If the dome seat adjuster and motors assembly. If the circuits are
lamp dims, the seat may be jamming. Check under not OK, repair the wire harness as required.
and behind the seat for binding or obstructions. If
the dome lamp does not dim, proceed with testing of POWER SEAT SWITCH
the individual components and circuits. For circuit descriptions and diagrams, refer to
8W-63 - Power Seat in Group 8W - Wiring Diagrams.
CIRCUIT BREAKER (1) Disconnect and isolate the battery negative
For circuit descriptions and diagrams, refer to cable.
8W-63 - Power Seat in Group 8W - Wiring Diagrams. (2) Remove the power seat switch from the power
(1) Locate the correct circuit breaker in the junc- seat.
tion block. Pull out the circuit breaker slightly, but (3) Use an ohmmeter to test the continuity of the
be certain that the circuit breaker terminals still con- power seat switches in each position. See the Power
tact the terminals in the junction block cavities. Seat Switch Continuity chart (Fig. 1). If OK, see the
(2) Connect the negative lead of a 12-volt DC volt- diagnosis for the Power Seat Adjuster and Motors in
meter to a good ground. this group. If not OK, replace the faulty power seat
(3) With the voltmeter positive lead, check both switch module.
terminals of the circuit breaker for battery voltage.
If only one terminal has battery voltage, the circuit
breaker is faulty and must be replaced. If neither ter-
minal has battery voltage, repair the open circuit
XJ POWER SEAT SYSTEMS 8R - 3
DIAGNOSIS AND TESTING (Continued)

REMOVAL AND INSTALLATION
POWER SEAT SWITCH
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the three screws that secure the seat
cushion side shield to the outboard seat cushion
frame.
(3) Pull the seat cushion side shield away from the
POWER SEAT SWITCH
seat cushion frame far enough to access the power
LEFT SEAT SWITCH seat switch wire harness connector.
SWITCH POSITION CONTINUITY BETWEEN (4) Unplug the wire harness connector from the
power seat switch.
Off B-E, B-J, B-K, B-L, (5) Remove the seat cushion side shield from the
B-M, B-N seat.
Vertical Up A-J, A-M, B-E, B-N (6) Remove the two screws that secure the power
seat switch to the inside of the seat cushion side
Vertical Down A-E, A-N, B-J, B-M shield (Fig. 2).
Horizontal Forward A-L, B-K
Horizontal Rearward A-K, B-L
Front Tilt Up A-M, B-N
Front Tilt Down A-N, B-M
Rear Tilt Up A-J, B-E
Rear Tilt Down A-E, B-J

RIGHT SEAT SWITCH
SWITCH POSITION CONTINUITY BETWEEN
Off A-E, A-J, A-K, A-L,
A-M, A-N
Vertical Up A-J, A-N, B-E, B-M
Vertical Down A-E, A-M, B-J, B-N Fig. 2 Power Seat Switch Remove/Install
1

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